iPadOS 9.9.15.2 (build 19C56) is an official Apple over-the-air update for the iPad Air 4 (WiFi), released on 2021-12-13T18:27:14Z. The update package is 4.25 GB. This is a full OTA update that can be applied from any compatible base version. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 22ecac4c1d4f43d574e0e81a7ae88e40de52ae3e.zip.